US5201174A - Auxiliary hydraulic pump system - Google Patents

Auxiliary hydraulic pump system Download PDF

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Publication number
US5201174A
US5201174A US07/801,299 US80129991A US5201174A US 5201174 A US5201174 A US 5201174A US 80129991 A US80129991 A US 80129991A US 5201174 A US5201174 A US 5201174A
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US
United States
Prior art keywords
pump
shuttle
pilot
engine
driven
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/801,299
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English (en)
Inventor
Dennis R. Barber
Gregory E. Sparks
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deere and Co
Original Assignee
Deere and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deere and Co filed Critical Deere and Co
Priority to US07/801,299 priority Critical patent/US5201174A/en
Assigned to DEERE & COMPANY A DE CORPORATION reassignment DEERE & COMPANY A DE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BARBER, DENNIS R., SPARKS, GREGORY E.
Priority to EP19920120050 priority patent/EP0545243A3/de
Priority to CA002083933A priority patent/CA2083933C/fr
Priority to MX9206891A priority patent/MX9206891A/es
Priority to JP4323123A priority patent/JPH05240152A/ja
Application granted granted Critical
Publication of US5201174A publication Critical patent/US5201174A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means

Definitions

  • the typical ground-driven auxiliary pump system includes a fixed displacement ground-driven pump, a series of check valves to provide bi-directional operation, and an unloading valve to reduce heat generation when the engine-driven pump is operating.
  • An object of this invention to provide a low cost, simple and efficient system which provides an auxiliary source of pressurized hydraulic fluid for a vehicle hydraulic system.
  • Another object of this invention to provide such a system which includes a ground-driven auxiliary pump.
  • Another object of this invention is to assure that the variable displacement pump will be in full stroke when the engine-driven pump is not operating.
  • Another object of this invention is to prevent pressure loss from the pilot chamber to sump when pressure from the engine-driven pump is high.
  • the present invention includes an engine driven main pump and an auxiliary ground-driven variable displacement pump which supply pressurized hydraulic fluid to vehicle brake and steering circuits.
  • a control circuit de-strokes the variable displacement pump when the engine driven pump is operational.
  • the variable displacement pump includes a piston movable in a bore in a housing. The piston divides the bore into a pilot chamber and a pump chamber. An auxiliary outlet line with a check valve communicates fluid one way from the pump chamber to the vehicle circuits. An auxiliary inlet line with a check valve communicates fluid one way from a reservoir to the pump chamber.
  • a ground-driven rotatable cam member engages the piston to reciprocate the piston in response to rotation of the rotatable member.
  • a spring urges the piston towards the rotatable member and towards a full stroke position.
  • the control circuit includes a pilot line which communicates fluid pressure from an outlet of the engine-driven pump to the pilot chamber.
  • a relief valve may be used to reduce the stroke of the variable displacement pump when the output pressure of the variable displacement pump is too high.
  • a shuttle valve assures that the variable displacement pump will be in full stroke when the engine-driven pump is not operating, and prevents pressure loss from the pilot chamber to sump when pressure from the engine-driven pump is high.
  • FIG. 1 is a partially cross sectional and partially schematic view of one embodiment of the present invention
  • FIG. 2 is a cross sectional view of the first embodiment of the present invention.
  • FIG. 3 is a cross sectional and partially schematic view of a second embodiment of the present invention.
  • FIG. 4 is a cross sectional view of the second embodiment of the present invention.
  • FIG. 5 is a cross sectional view along lines 5--5 of FIG. 4.
  • a vehicle (not shown) includes an engine 10 which, when operating, drives a hydraulic pump 12 which draws hydraulic fluid from reservoir 14 through conduit 16 and supplies hydraulic fluid under pressure through line or conduit 18 and check valve 19 to a the vehicle hydraulic brake circuit 20 and, via a priority valve 22, to the vehicle hydraulic steering circuit 24 and the cooling and lube circuits 26.
  • the check valve 19 permits flow of hydraulic fluid from the engine-driven pump 12 to the brake circuit 20 and the valve 22, while preventing such flow in the opposite direction if the pressure on the engine-driven pump side drops below a predetermined value.
  • the priority valve 22 and the circuits 20, 24 and 26 are conventional and wellknown.
  • An auxiliary source of pressurized hydraulic fluid includes a ground driven variable displacement pump 30 and a control circuit for de-stroking the variable displacement pump 30 when the engine driven pump 12 is operational.
  • the variable displacement pump 30 includes a piston 32 movable in a bore 34 in a housing 36.
  • the piston 32 divides the bore 34 into a pilot chamber 38 and a pump chamber 40.
  • An auxiliary outlet line 42 with a check valve 44 communicates fluid one way from the pump chamber 40 to the main outlet line 18.
  • An auxiliary inlet line 46 with a check valve 48 communicates fluid one way from the main inlet line 16 to the pump chamber 40.
  • a pilot line 28 communicates fluid pressure from the main outlet line 18 to the pilot chamber 38.
  • a reversible ground-driven rotatable cam member 50 engages the piston 32 to reciprocate the piston in response to rotation of the rotatable member 50.
  • a spring 52 is mounted in the pump chamber 40 and urges the piston 32 to a full stroke position.
  • the pressure in the pilot line 28 moves the piston 32 away from the cam member 50, thus de-stroking the variable displacement pump 30.
  • the pressure in pilot line 28 drops, allowing the piston to move towards the cam member 50, causing the variable displacement pump 30 to go into stroke.
  • a relief conduit 60 communicates outlet line 42 with pilot line 28.
  • a relief valve 62 may be inserted in the relief conduit 60 to reduce the stroke of the variable displacement pump 30 when the output pressure of the variable displacement pump 30 has reached the pressure which is necessary for the brake and steering functions.
  • a spring 64 and tension adjusting device 66 biases a ball 68 of the relief valve 62 to a position is closing communication from outlet 42 to pilot chamber 38.
  • conduit 18 When hydraulic pressure is present in conduit 18, as will normally be the case when the engine 10 is operating, the spring 52 will be compressed and the piston 32 will be shifted to the left, viewing FIG. 1. When so shifted, the piston 32 will not reciprocate, or its stroke will be reduced as the cam member 50 rotates.
  • the brake and steering circuits 20,26 will receive hydraulic fluid pressure from the auxiliary pump 30 to operate the vehicle brake and steering systems as they normally would in receiving hydraulic fluid from the engine-driven pump 12.
  • a shuttle check valve 70 has a first or shuttle inlet port communicated with the outlet of the engine driven pump 12, a second or drain port communicated with the reservoir 14 and a third or shuttle pilot port which is communicated with pilot chamber 38 via passage 72, the bore of the relief valve 62 and passage 60.
  • the passage extending to the left from relief valve 62 is blocked by a plug 74 and passage 72 communicates passage 60 with a chamber 76 of shuttle check valve 70.
  • This chamber 76 is communicated with reservoir 14 via valve seat 78 and passage 80 and with the outlet of the engine driven pump 12 via valve seat 84 and passage 82.
  • a spring 86 normally biases the ball 88 of shuttle check valve 70 into sealing engagement with valve seat 84.
  • the ball 88 of shuttle check valve 70 moves into sealing engagement with valve seat 78 and the shuttle check valve 70 blocks drain passage 80 when the outlet pressure from the engine-driven pump 12 is high, as it is under normal conditions, thus eliminating power loss through passage 80 and orifice 81.
  • spring 86 will move the ball 88 away from seat 78 to open communication from chamber 38 to reservoir 14 via passages 60, 72 and 80, thus placing the piston 32 in a full stroke condition.
  • a cap seal 90 (preferably made of a low friction material) and an O-ring seal 92 are installed in an annular seal groove 94 in the periphery of the piston 32.
  • the cap seal 90 and the O-ring seal 92 eliminate drift and keep the piston 32 de-stroked when the engine driven pump 12 is operating and the pilot pressure in chamber 38 is high.
US07/801,299 1991-12-02 1991-12-02 Auxiliary hydraulic pump system Expired - Fee Related US5201174A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US07/801,299 US5201174A (en) 1991-12-02 1991-12-02 Auxiliary hydraulic pump system
EP19920120050 EP0545243A3 (en) 1991-12-02 1992-11-25 Hydraulic circuit for motor vehicle
CA002083933A CA2083933C (fr) 1991-12-02 1992-11-26 Systeme de pompage du fluide hydraulique entraine par la traction au sol
MX9206891A MX9206891A (es) 1991-12-02 1992-11-30 Sistema de bomba hidraulica auxiliar.
JP4323123A JPH05240152A (ja) 1991-12-02 1992-12-02 補助液圧ポンプ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/801,299 US5201174A (en) 1991-12-02 1991-12-02 Auxiliary hydraulic pump system

Publications (1)

Publication Number Publication Date
US5201174A true US5201174A (en) 1993-04-13

Family

ID=25180728

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/801,299 Expired - Fee Related US5201174A (en) 1991-12-02 1991-12-02 Auxiliary hydraulic pump system

Country Status (5)

Country Link
US (1) US5201174A (fr)
EP (1) EP0545243A3 (fr)
JP (1) JPH05240152A (fr)
CA (1) CA2083933C (fr)
MX (1) MX9206891A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6679684B2 (en) * 2001-02-13 2004-01-20 Toyota Jidosha Kabushiki Kaisha Pump device having a device for restricting movement of a movable member movable to pressurize working fluid
US20070041850A1 (en) * 2005-08-19 2007-02-22 Kelsey-Hayes Company Multi-piston pump and valve arrangement
US20070107421A1 (en) * 2005-11-16 2007-05-17 Deere & Company, A Delaware Corporation Dual pump dual pressure hydraulic circuit
EP1355059B1 (fr) * 2002-04-19 2010-02-17 Nissan Motor Co., Ltd. Pompe à carburant
US20100147618A1 (en) * 2008-12-16 2010-06-17 Nissan Motor Co., Ltd. Steering control apparatus
GB2509186A (en) * 2012-12-21 2014-06-25 Agco Netherlands Bv Emergency steering mode of a vehicle hydraulic system having a first pump driven by a prime mover and a second pump driven by a ground engaging member
US9867325B2 (en) 2014-04-29 2018-01-16 Cnh Industrial America Llc Work vehicle with hydraulic assist for power off steering
US10207710B1 (en) 2014-06-25 2019-02-19 Kurt Daims Steering and braking systems for a coasting motor vehicle
US11884151B1 (en) 2023-03-23 2024-01-30 Dana Belgium N.V. Power take-off (PTO) assembly with a disconnect clutch

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064750A (en) * 1932-04-23 1936-12-15 Bosch Robert Piston pump for the conveyance of liquids
US3006148A (en) * 1958-10-06 1961-10-31 Gen Motors Corp Transmission pump system
US3280557A (en) * 1965-03-11 1966-10-25 Ford Motor Co Safety control circuit for power steering unit
US3800900A (en) * 1968-09-27 1974-04-02 Ford Motor Co Hydraulic steering system having auxiliary power source
US3820620A (en) * 1973-03-29 1974-06-28 Deere & Co Vehicle power steering electrohydraulic safety backup system
US3962870A (en) * 1975-04-23 1976-06-15 International Harvester Company Variable volume dual pump circuit
US3968650A (en) * 1974-05-15 1976-07-13 Societe Anonyme: Poclain Fluid feed device comprising a constant cylinder capacity pump and at least one variable cylinder capacity pump
US3995711A (en) * 1976-03-18 1976-12-07 Deere & Company Vehicle power steering electro-hydraulic safety backup system
US4015681A (en) * 1975-11-06 1977-04-05 International Harvester Company Ground driven hydraulic emergency steering system
US4076096A (en) * 1976-11-24 1978-02-28 Clark Equipment Company Hydraulic steering system
US4160490A (en) * 1977-06-09 1979-07-10 International Harvester Company Auxiliary steering system
US4303089A (en) * 1980-10-14 1981-12-01 Deere & Company Steering including accumulator for supplying emergency reserve of fluid
US4317499A (en) * 1979-12-26 1982-03-02 Deere & Company Vehicle emergency steering system
US4326558A (en) * 1980-11-24 1982-04-27 Deere & Company Steering system including accumulator for supplying emergency reserve of fluid
US4345660A (en) * 1979-12-26 1982-08-24 Deere & Company Vehicle emergency steering system
EP0065304A2 (fr) * 1981-05-18 1982-11-24 Deere & Company Transmission électrohydraulique
US4515530A (en) * 1982-11-23 1985-05-07 Wabco Westinghouse Fahrzeugbremsen Gmbh Disabling arrangement for a reciprocating piston compressor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747725A (en) * 1971-03-15 1973-07-24 Ford Motor Co Power steering system with auxiliary pump
DE2731975C3 (de) * 1977-07-15 1980-08-28 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Hilfskraftlenkung für Kraftfahrzeuge

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064750A (en) * 1932-04-23 1936-12-15 Bosch Robert Piston pump for the conveyance of liquids
US3006148A (en) * 1958-10-06 1961-10-31 Gen Motors Corp Transmission pump system
US3280557A (en) * 1965-03-11 1966-10-25 Ford Motor Co Safety control circuit for power steering unit
US3800900A (en) * 1968-09-27 1974-04-02 Ford Motor Co Hydraulic steering system having auxiliary power source
US3820620A (en) * 1973-03-29 1974-06-28 Deere & Co Vehicle power steering electrohydraulic safety backup system
US3968650A (en) * 1974-05-15 1976-07-13 Societe Anonyme: Poclain Fluid feed device comprising a constant cylinder capacity pump and at least one variable cylinder capacity pump
US3962870A (en) * 1975-04-23 1976-06-15 International Harvester Company Variable volume dual pump circuit
US4015681A (en) * 1975-11-06 1977-04-05 International Harvester Company Ground driven hydraulic emergency steering system
US3995711A (en) * 1976-03-18 1976-12-07 Deere & Company Vehicle power steering electro-hydraulic safety backup system
US4076096A (en) * 1976-11-24 1978-02-28 Clark Equipment Company Hydraulic steering system
US4160490A (en) * 1977-06-09 1979-07-10 International Harvester Company Auxiliary steering system
US4317499A (en) * 1979-12-26 1982-03-02 Deere & Company Vehicle emergency steering system
US4345660A (en) * 1979-12-26 1982-08-24 Deere & Company Vehicle emergency steering system
US4303089A (en) * 1980-10-14 1981-12-01 Deere & Company Steering including accumulator for supplying emergency reserve of fluid
US4326558A (en) * 1980-11-24 1982-04-27 Deere & Company Steering system including accumulator for supplying emergency reserve of fluid
EP0065304A2 (fr) * 1981-05-18 1982-11-24 Deere & Company Transmission électrohydraulique
US4515530A (en) * 1982-11-23 1985-05-07 Wabco Westinghouse Fahrzeugbremsen Gmbh Disabling arrangement for a reciprocating piston compressor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6679684B2 (en) * 2001-02-13 2004-01-20 Toyota Jidosha Kabushiki Kaisha Pump device having a device for restricting movement of a movable member movable to pressurize working fluid
EP1355059B1 (fr) * 2002-04-19 2010-02-17 Nissan Motor Co., Ltd. Pompe à carburant
US20070041850A1 (en) * 2005-08-19 2007-02-22 Kelsey-Hayes Company Multi-piston pump and valve arrangement
US20070107421A1 (en) * 2005-11-16 2007-05-17 Deere & Company, A Delaware Corporation Dual pump dual pressure hydraulic circuit
US7401465B2 (en) 2005-11-16 2008-07-22 Deere & Company Dual pump dual pressure hydraulic circuit
US20100147618A1 (en) * 2008-12-16 2010-06-17 Nissan Motor Co., Ltd. Steering control apparatus
GB2509186A (en) * 2012-12-21 2014-06-25 Agco Netherlands Bv Emergency steering mode of a vehicle hydraulic system having a first pump driven by a prime mover and a second pump driven by a ground engaging member
US9867325B2 (en) 2014-04-29 2018-01-16 Cnh Industrial America Llc Work vehicle with hydraulic assist for power off steering
US10207710B1 (en) 2014-06-25 2019-02-19 Kurt Daims Steering and braking systems for a coasting motor vehicle
US11884151B1 (en) 2023-03-23 2024-01-30 Dana Belgium N.V. Power take-off (PTO) assembly with a disconnect clutch

Also Published As

Publication number Publication date
JPH05240152A (ja) 1993-09-17
EP0545243A3 (en) 1993-09-29
CA2083933A1 (fr) 1993-06-03
MX9206891A (es) 1993-06-01
CA2083933C (fr) 1995-11-07
EP0545243A2 (fr) 1993-06-09

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AS Assignment

Owner name: DEERE & COMPANY A DE CORPORATION, ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:BARBER, DENNIS R.;SPARKS, GREGORY E.;REEL/FRAME:005936/0894;SIGNING DATES FROM 19911112 TO 19911122

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STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20050413